arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1604.08293cond-mat.supr-con
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超导拓扑绝缘体Sr0.065 Bi 2Se 3的压力诱导超导电性再现

Pressure induced re-emergence of superconductivity in superconducting topological insulator Sr0.065Bi2Se3

Yonghui Zhou, Xuliang Chen, Ranran Zhang, Jifeng Shao, Xuefei Wang, Chao An, Ying Zhou, Changyong Park, Wei Tong, Li Pi, Zhaorong Yang, Changjin Zhang, Yuheng Zhang

摘要:

最近发现的Sr $_x$ Bi $_2$ Se $_3$超导体为研究可能的拓扑超导电性提供了另一种理想的材料基础。在这里,我们报告说,在Sr $_{0.065}$ Bi $_{2}$ Se $_3$,周围的超导相是逐渐压低后,施加外部压力。在高压下,在6GPa以上出现第二相,最大$\sim$值为$\sim$ 8.3K。高压同步辐射X射线衍射和电输运性质的联合研究表明,Sr $_{0.065}$ Bi $_{2}$ Se $_3$的超导电性的重新出现与其在6 GPa附近从环境菱面体相到高压单斜相的结构相变,以及在25 GPa以上进一步到另一高压四斜相的结构相变密切相关.

英文摘要:

The recent-discovered Sr$_x$Bi$_2$Se$_3$ superconductor provides an alternative and ideal material base for investigating possible topological superconductivity. Here, we report that in Sr$_{0.065}$Bi$_{2}$Se$_3$, the ambient superconducting phase is gradually depressed upon the application of external pressure. At high pressure, a second superconducting phase emerges at above 6 GPa, with a maximum $T_c$ value of $\sim$8.3 K. The joint investigations of the high-pressure synchrotron x-ray diffraction and electrical transport properties reveal that the re-emergence of superconductivity in Sr$_{0.065}$Bi$_{2}$Se$_3$ is closely related to the structural phase transition from ambient rhombohedral phase to high-pressure monoclinic phase around 6 GPa, and further to another high-pressure tetragonal phase above 25 GPa.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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